Finding the Fourth Proportional to 5,819.72, 8,028.59 and 3,930.71

Step by Step Solution

1. Step 1: Write the proportion equation
   5,819.72 : 8,028.59 = 3,930.71 : x
2. Step 2: Convert to fraction form
   5,819.72/8,028.59 = 3,930.71/x
3. Step 3: Cross multiply
   5,819.72x = 8,028.59 × 3,930.71
4. Step 4: Simplify right side
   5,819.72x = 31,557,999.20
5. Step 5: Solve for x
   x = 31,557,999.20/5,819.72
6. Step 6: Final answer
   x = 5,422.60